Spring nut lock



FIG. 1 is a side elevational view of a spring nut lock showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is an end elevational view thereof;

FIG. 5 is a perspective view thereof, the nut and bolt being shown in broken lines for illustrative purposes only. 

The ornamental design for the spring nut lock, as shown and described. 